Improved safety steam-boiler



i UNITED STATES PATENT l OFFICE.

LEVIN P. CLARK, OF. BALTIMORE, MARYLAND.

IMPROVED SAFETY STEAM-BOILER.

Specification forming part of Letters Patent No. 762, dated May 30,1838.

To all whom, t may concern.'

Be it known that I, LEVIN P. CLARK, of the city of Baltimore and in theState of Maryland. have invented an Improvement in the Manner ofConstructing Boilers for Steam- Engines; and I do hereby declare thatthe following is a full and exact description thereof.

My steam-boiler consists of a number of cylinders, within which thewater is to be contained, which cylinders I have arranged and connectedtogelherby means ot tubes passing from one cylinder' to another in amanner which I believe to be substantially new and which I have foundupon trial to be productive of very advantageous results.

Figure l is a vertical section of my boiler and furnace from front toback. The furnace-door is situated at A, the grate-bars at B and C,being the body of the furnace. E and F are rows of cylindrical boilers,arranged one row above the other, the centers of the upper boilers beingimmediately over-the adjoining sides of the lower boilers, the draft tothe chimney G being from front to back under the lower boilers andthence forward between vthe two rows. From the middle or from any otherpreferred part of each of the upper boilers rise tubes I-I IVI, whichopen into the boilers and into a tube or cylinder I, the tubes H and Iforming the steamchamber, from which the cylinders of the engine are toreceive their supply. The upper and lower row of boilers are connectedat each end by tubes K K, and the lower row ofv boilers are connectedwith the supply-pipe by a tube L L, proceeding,r horizontally from oneend of each of them to the said supply-pipe M, Fig. 3, which is a topView of three ot' those boilers.

Fig. 3 is a view of one end of the furnace and boilers, with theirman-holes, the supply pipe` and the tubes leading from it into each ofthe lower boilers being supposed t0 be at the opposite end. p

I have not deemed it necessary to mention any particular dimensions ofthe 'nes/pective parts, as these will vary accoegl'ing to the powerrequired and any statem nt of them is not only unnecessary, but would beuseless to a skillful boiler-maker.

I am aware that numerous tubulaior cylindrical boilers havebeenconstructed and used, but, as I firmly believe, not combined andconnected together, and producing their conjoint action in the samemanner or effecting the purpose aimed at as fully and advantageously asby my boiler. Although I do not therefore dclaim to be the inventor ofcombined tubular or cylindrical boilers or of any of the parts of theboiler by me described, taken separately,

' I do claim-' The combination and arrangement of these K parts taken asa whole, when made and constructed with the boilers arranged andconnected with the steam-tube, with the supplyv pipe, and with eachother specifically and substantially as herein set forth.

